<p>
  machine-room works!
</p>
<div class="tools">
<nz-collapseset [nzAccordion]="true">
  <nz-collapse  nzTitle="机柜" nzActive="true">
    <div>
      <div class="toools"></div>
    </div>
  </nz-collapse>
  <nz-collapse  nzTitle="安全防范" nzActive="false">
    <p>2 的内容</p>
     
  </nz-collapse>
  <nz-collapse  nzTitle="自定义" nzActive="false">
    <p>23 的内容</p>
     
  </nz-collapse>
</nz-collapseset>
</div>
<div class="machine-room">
</div>